问题补充：
He thoughtmattered most in improving your spoken English was enough confidence and practice.
A. why
B. what
C. which
D. that
答案：
A. why
(答案→)B. what
C. which
D. that
解析：考查句子分析。thought后应是宾语从句,关系词在从句中做matter的主语故排除A why是副词不能做主语。what什么；which哪一个；that那个。句意是他认为对于提高你的英语口语最重要的是有足够的自信心和练习。故选B.
